With regard to the polls. If Unifor's poll should be thrown out, so should the Global Petroleum Show's poll. The rationale is not that these polls were not conducted properly, but rather that the reason why they are leaked could be politically motivated. IE, are there earlier or more recent polls conducted by the same groups that made different conclusions that were selectively not revealed? We cannot know, so we should ignore those data points. That's how CBC poll tracker Eric Grenier rationalized not including the unifor poll, and that's how I imagine he would treat the Global petroleum show poll a well.
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